package com.xdf.xzymanagementsystem.util;

import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.stereotype.Component;

import java.io.*;
import java.net.*;
import java.util.List;
import java.util.Map;

@Component
public class HttpUtils {
    static boolean proxySet = false;
    static String proxyHost = "127.0.0.1";
    static int proxyPort = 8087;

    private static final ObjectMapper mapper = new ObjectMapper();

    // 请求新的 wechat access token 测试通过
    public static String sendGet(String httpurl) {
        HttpURLConnection connection = null;
        InputStream is = null;
        BufferedReader br = null;
        String result = null;// 返回结果字符串
        try {
            // 创建远程url连接对象
            URL url = new URL(httpurl);
            // 通过远程url连接对象打开一个连接，强转成httpURLConnection类
            connection = (HttpURLConnection) url.openConnection();
            // 设置连接方式：get
            connection.setRequestMethod("GET");
            // 设置连接主机服务器的超时时间：15000毫秒
            connection.setConnectTimeout(15000);
            // 设置读取远程返回的数据时间：60000毫秒
            connection.setReadTimeout(60000);
            // 发送请求
            connection.connect();

            int resCode = connection.getResponseCode();
            // 通过connection连接，获取输入流
            if (connection.getResponseCode() == 200) {
                is = connection.getInputStream();
                // 封装输入流is，并指定字符集
                br = new BufferedReader(new InputStreamReader(is, "UTF-8"));
                // 存放数据
                StringBuffer sbf = new StringBuffer();
                String temp = null;
                while ((temp = br.readLine()) != null) {
                    sbf.append(temp);
                    sbf.append("\r\n");
                }
                result = sbf.toString();
            }
        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            // 关闭资源
            if (null != br) {
                try {
                    br.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

            if (null != is) {
                try {
                    is.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

            connection.disconnect();// 关闭远程连接
        }

        return result;
    }

    /**
     * 编码
     * @param source
     * @return
     */
    public static String urlEncode(String source,String encode) {
        String result = source;
        try {
            result = java.net.URLEncoder.encode(source,encode);
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
            return "0";
        }
        return result;
    }
    public static String urlEncodeGBK(String source) {
        String result = source;
        try {
            result = java.net.URLEncoder.encode(source,"GBK");
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
            return "0";
        }
        return result;
    }
    /**
     * 发起http请求获取返回结果
     * @param req_url 请求地址
     * @return
     */
    public static String httpRequest(String req_url) {
        StringBuffer buffer = new StringBuffer();
        try {
            URL url = new URL(req_url);
            HttpURLConnection httpUrlConn = (HttpURLConnection) url.openConnection();

            httpUrlConn.setDoOutput(false);
            httpUrlConn.setDoInput(true);
            httpUrlConn.setUseCaches(false);

            httpUrlConn.setRequestMethod("GET");
            httpUrlConn.connect();

            // 将返回的输入流转换成字符串
            InputStream inputStream = httpUrlConn.getInputStream();
            InputStreamReader inputStreamReader = new InputStreamReader(inputStream, "utf-8");
            BufferedReader bufferedReader = new BufferedReader(inputStreamReader);

            String str = null;
            while ((str = bufferedReader.readLine()) != null) {
                buffer.append(str);
            }
            bufferedReader.close();
            inputStreamReader.close();
            // 释放资源
            inputStream.close();
            inputStream = null;
            httpUrlConn.disconnect();

        } catch (Exception e) {
            //System.out.println(e.getStackTrace());
        }
        return buffer.toString();
    }

    /**
     * 发送http请求取得返回的输入流
     * @param requestUrl 请求地址
     * @return InputStream
     */
    public static InputStream httpRequestIO(String requestUrl) {
        InputStream inputStream = null;
        try {
            URL url = new URL(requestUrl);
            HttpURLConnection httpUrlConn = (HttpURLConnection) url.openConnection();
            httpUrlConn.setDoInput(true);
            httpUrlConn.setRequestMethod("GET");
            httpUrlConn.connect();
            // 获得返回的输入流
            inputStream = httpUrlConn.getInputStream();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return inputStream;
    }


    /**
     * 向指定URL发送GET方法的请求
     * 本方法用于请求 wechat access token 测试失败
     * 其他请求后端数据的测试是通过的
     * @param url
     *            发送请求的URL
     * @param param
     *            请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
     * @return URL 所代表远程资源的响应结果
     */
    public static String sendGet(String url, String param) {
        String result = "";
        BufferedReader in = null;
        try {
            String urlNameString = url + "?" + param;
            URL realUrl = new URL(urlNameString);
            // 打开和URL之间的连接
            URLConnection connection = realUrl.openConnection();
            // 设置通用的请求属性
            connection.setRequestProperty("accept", "*/*");
            connection.setRequestProperty("connection", "Keep-Alive");
            connection.setRequestProperty("user-agent",
                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            // 建立实际的连接
            connection.connect();
            // 获取所有响应头字段
            Map<String, List<String>> map = connection.getHeaderFields();
            // 遍历所有的响应头字段
            for (String key : map.keySet()) {
                //System.out.println(key + "--->" + map.get(key));
            }
            // 定义 BufferedReader输入流来读取URL的响应
            in = new BufferedReader(new InputStreamReader(
                    connection.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            //System.out.println("发送GET请求出现异常！" + e);
            e.printStackTrace();
        }
        // 使用finally块来关闭输入流
        finally {
            try {
                if (in != null) {
                    in.close();
                }
            } catch (Exception e2) {
                e2.printStackTrace();
            }
        }
        return result;
    }

    /**
     * 向指定 URL 发送POST方法的请求
     * 请求前后端分离项目的后端的接口失败
     * @param url
     *            发送请求的 URL
     * @param param
     *            请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
     * @param isproxy
     *               是否使用代理模式
     * @return 所代表远程资源的响应结果
     */
    public static String postForm(String url, String param,boolean isproxy) {
        OutputStreamWriter out = null;
        BufferedReader in = null;
        String result = "";
        try {
            URL realUrl = new URL(url);
            HttpURLConnection conn = null;
            if(isproxy){//使用代理模式
                @SuppressWarnings("static-access")
                Proxy proxy = new Proxy(Proxy.Type.DIRECT.HTTP, new InetSocketAddress(proxyHost, proxyPort));
                conn = (HttpURLConnection) realUrl.openConnection(proxy);
            }else{
                conn = (HttpURLConnection) realUrl.openConnection();
            }
            // 打开和URL之间的连接

            // 发送POST请求必须设置如下两行
            conn.setDoOutput(true);
            conn.setDoInput(true);
            conn.setRequestMethod("POST");    // POST方法


            // 设置通用的请求属性

            conn.setRequestProperty("accept", "*/*");
            conn.setRequestProperty("connection", "Keep-Alive");
            conn.setRequestProperty("user-agent",
                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
//            conn.setRequestProperty("Content-Type", "application/json");
            conn.connect();

            // 获取URLConnection对象对应的输出流
            out = new OutputStreamWriter(conn.getOutputStream(), "UTF-8");
            // 发送请求参数
            out.write(param);
            // flush输出流的缓冲
            out.flush();
            // 定义BufferedReader输入流来读取URL的响应
            in = new BufferedReader(
                    new InputStreamReader(conn.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
//            System.out.println("发送 POST 请求出现异常！"+e);
            e.printStackTrace();
        }
        //使用finally块来关闭输出流、输入流
        finally{
            try{
                if(out!=null){
                    out.close();
                }
                if(in!=null){
                    in.close();
                }
            }
            catch(IOException ex){
                ex.printStackTrace();
            }
        }
        return result;
    }

    /**
     * 发送 post 请求，可以传入对象类型参数
     * @param url 请求的地址
     * @param param 对象类型的参数
     * @return
     * @throws Exception
     */
    public String postJson(String url, Object param) throws Exception {
        String jsonString = mapper.writeValueAsString(param);
        return postJson( url, jsonString);
    }

    /**
     * 请求纯后端接口测试成功
     * 发送post请求，请求参数为json格式
     * 传入的参数
     * String paraJson = "{\"b_dingdanhao\":\"ordercode\",\"b_clientname\":\"云企\"}";
     * @param url
     * @param params 类似 {"name":"xxx","age":18}
     * @return
     * @throws Exception
     */
    public static String postJson(String url, String params) throws Exception {
        URL httpUrl = new URL(url);
        HttpURLConnection connection = (HttpURLConnection) httpUrl.openConnection();
        connection.setRequestProperty("content-type", "application/json;charset=utf-8");
        connection.setDoOutput(true);
        connection.setRequestMethod("POST");
        connection.connect();
        BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(connection.getOutputStream()));
        bufferedWriter.write(params);
        bufferedWriter.flush();
        bufferedWriter.close();
        StringBuilder content = new StringBuilder();
        if (connection.getResponseCode() == 200) {
            BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
            String str;
            while ((str = bufferedReader.readLine()) != null) {
                content.append(str);
            }
            bufferedReader.close();
            return content.toString();
        } else {
            System.err.println(connection.getResponseCode());
        }
        return "";
    }

    // 2021年1月28日 17:09:08 测试了 sendGet、postJson 成功
    // postForm 测试失败
    public static void main(String[] args) throws Exception {
        //demo:代理访问
        String url = "http://182.254.216.227:7072/white/whip/insert";
        String paraForm = "b_dingdanhao=ordercode&b_clientname=云企";
        String paraJson = "{\"b_dingdanhao\":\"ordercode\",\"b_clientname\":\"云企\"}";

//        String result = HttpUtils.postForm(url,paraJson,true);
        //String result = HttpUtils.sendGet(url,para);
        String result = HttpUtils.postJson(url,paraJson);

//        System.out.println(result);
    }
}
